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Little Sarasota Bay Condition Report for 2017

View 2016 Report

Caution

2 out of 3 indicators were rated as PASS.

All three indicators must pass
for the bay to be rated as PASS.

Learn more about how this report is created

Summary:

The overall health of Little Sarasota Bay in 2017 was good and changed little from the previous year. The annual mean concentration of chlorophyll increased slightly, while nitrogen concentration decreased; they retained their 2016 ratings of "Caution" and "Good", respectively. Phosphorus concentration was slightly higher, but it still fell well below the desired target value.

Water Quality: The ratings for chlorophyll a, nitrogen, and phosphorus remained unchanged from 2016. Chlorophyll a concentration increased to 0.015 mg/l, remaining above the threshold of 0.0104 mg/l. The mean nitrogen concentration decreased slightly, to 0.565 mg/l, exceeding the target concentration of 0.52 mg/l but remaining below the threshold of 0.60 mg/l. While phosphorus concentration increased to 0.1076 mg/l, that value is  well below the target of 0.180 mg/l. The mean for chlorophyll a was calculated as an arithmetic mean and the means for nitrogen and phosphorus were calculated as geometric means (per the Numeric Nutrient Criteria outlined in the Florida Administrative Code, section 62-302.532).

Biotic Indicator: Measurement of the biotic indicator, seagrass, was performed in 2016 by the Southwest Florida Water Management District. Total seagrass acreage in Little Sarasota Bay decreased from 999 acres to 872 acres, remaining above the target level of 702 acres.

Bay Location Map

Bays included in this report:

Water Chemistry Ratings

Total nitrogen, total phosphorus, and chlorophyll a levels are monitored carefully by water resource managers and used by regulatory authorities to determine whether a bay meets the water quality standards mandated by the Clean Water Act. The trend graphs for these indicators are shown below, along with their target and threshold values. A target value is a desirable goal to be attained, while a threshold is an undesirable level which is to be avoided. Learn More about these ratings and how they are calculated »

The Five-year Trend Graphs below illustrate the general trend of water quality parameters. They show a six-month running average, which moderates high and low values in the data.

Caution

Chlorophyll a

Score: Caution How was this determined?
Units: mg/l Year
2017
Historical
period of record
High 0.0969 0.0969
Mean 0.015 0.0081 0.00803342 0.0082000000
Low 0.0005 0.0001
No. of Samples 74 2,698

Five-year Trend Graph

     
1/1/20133.69120.0086300mg/l
2/1/20134.78120.0068900mg/l
3/1/20134.43120.0054600mg/l
4/1/20134.73120.0046800mg/l
5/1/20133.95120.0041100mg/l
6/1/20137.33120.0048200mg/l
7/1/201319.91120.0075200mg/l
8/1/201313.11120.0089100mg/l
9/1/201315.90120.0108200mg/l
10/1/201333.59120.0156300mg/l
11/1/20138.29120.0163600mg/l
12/1/20133.41120.0157000mg/l
1/1/20143.60120.0129800mg/l
2/1/20143.34120.0113600mg/l
3/1/20144.05120.0093800mg/l
4/1/20145.15120.0046400mg/l
5/1/20146.76120.0043900mg/l
6/1/20146.25120.0048600mg/l
7/1/20146.06120.0052700mg/l
8/1/20145.32120.0056000mg/l
9/1/20146.09120.0059400mg/l
10/1/201421.00140.0085800mg/l
11/1/20146.04120.0084600mg/l
12/1/20146.42140.0084900mg/l
1/1/201513.45180.0097200mg/l
2/1/20153.11180.0093500mg/l
3/1/20154.87210.0091500mg/l
4/1/20153.27120.0061900mg/l
5/1/20153.19140.0057200mg/l
6/1/20153.81120.0052800mg/l
7/1/20155.85120.0040200mg/l
8/1/201516.45120.0062400mg/l
9/1/201519.54120.0086900mg/l
10/1/201519.29120.0113600mg/l
11/1/201518.89140.0139700mg/l
12/1/201514.39120.0157400mg/l
1/1/20162.52120.0151800mg/l
2/1/20166.12140.0134600mg/l
3/1/20164.19140.0109000mg/l
4/1/20163.85120.0083300mg/l
5/1/20164.51140.0059300mg/l
6/1/20169.79120.0051600mg/l
7/1/20167.75120.0060400mg/l
8/1/201610.13120.0067000mg/l
9/1/201642.9060.0131600mg/l
10/1/201630.3360.0175700mg/l
11/1/201615.7860.0194500mg/l
12/1/201613.5160.0200700mg/l
1/1/20172.8360.0192500mg/l
2/1/20172.8870.0180400mg/l
3/1/20172.3460.0112800mg/l
4/1/20174.8860.0070400mg/l
5/1/20173.9960.0050700mg/l
6/1/201718.2060.0058500mg/l
7/1/20174.5560.0061400mg/l
8/1/201715.6860.0082700mg/l
9/1/201775.1760.0204100mg/l
10/1/201729.8160.0245700mg/l
11/1/201712.5060.0259900mg/l
12/1/201710.2570.0246600mg/l
Loading Chart...
Target
0.0082 mg/l
Threshold
0.0104 mg/l
Good

Nitrogen, Total

Units: mg/l Year
2017
Historical
period of record
High 1.465 1.465
Mean 0.565 0.4822 0.17929653 0.5200000000
Low 0.265 0.055
No. of Samples 74 1,508

Five-year Trend Graph

     
1/1/2013385.0060.5232800mg/l
2/1/2013378.3360.4796700mg/l
3/1/2013283.3360.4077200mg/l
4/1/2013436.6760.3707800mg/l
5/1/2013491.6760.3790000mg/l
6/1/2013511.1760.4143600mg/l
7/1/2013810.0060.4852000mg/l
8/1/2013765.0060.5496400mg/l
9/1/2013846.6760.6435300mg/l
10/1/20131018.8360.7405600mg/l
11/1/2013621.6760.7622200mg/l
12/1/2013556.3360.7697500mg/l
1/1/2014421.6760.7050300mg/l
2/1/2014483.3360.6580800mg/l
3/1/2014513.3360.6025300mg/l
4/1/2014492.0060.5147200mg/l
5/1/2014566.6760.5055600mg/l
6/1/2014583.3360.5100600mg/l
7/1/2014535.8360.5290800mg/l
8/1/2014609.0060.5500300mg/l
9/1/2014709.1760.5826700mg/l
10/1/2014857.8670.6436400mg/l
11/1/2014606.6760.6503100mg/l
12/1/2014546.4370.6441600mg/l
1/1/2015616.3360.6575800mg/l
2/1/2015405.0060.6235800mg/l
3/1/2015469.2970.5836000mg/l
4/1/2015340.0060.4972900mg/l
5/1/2015469.2970.4743900mg/l
6/1/2015498.3360.4663700mg/l
7/1/2015542.0060.4539900mg/l
8/1/2015703.3360.5037100mg/l
9/1/2015740.0060.5488300mg/l
10/1/2015638.5060.5985800mg/l
11/1/2015653.5770.6292900mg/l
12/1/2015551.6760.6381800mg/l
1/1/2016669.0060.6593500mg/l
2/1/2016508.1470.6268100mg/l
3/1/2016497.8670.5864600mg/l
4/1/2016538.8360.5698500mg/l
5/1/2016470.7170.5393700mg/l
6/1/2016515.1760.5332900mg/l
7/1/2016443.8360.4957600mg/l
8/1/2016556.6760.5038500mg/l
9/1/20161055.0060.5967000mg/l
10/1/2016870.8360.6520400mg/l
11/1/2016662.1760.6839500mg/l
12/1/2016468.3360.6761400mg/l
1/1/2017434.6760.6746100mg/l
2/1/2017519.4370.6684100mg/l
3/1/2017411.6760.5611800mg/l
4/1/2017375.0060.4785500mg/l
5/1/2017488.3360.4495700mg/l
6/1/2017671.1760.4833800mg/l
7/1/2017619.0060.5141000mg/l
8/1/2017734.0060.5498600mg/l
9/1/20171313.3360.7001400mg/l
10/1/2017733.3360.7598600mg/l
11/1/2017543.3360.7690300mg/l
12/1/2017462.1470.7341900mg/l
Loading Chart...
Target
0.52 mg/l
Threshold
0.60 mg/l
Excellent

Phosphorus, Total

Score: Excellent How was this determined?
Units: mg/l Year
2017
Historical
period of record
High 0.25 0.699
Mean 0.1076 0.1297 0.07568176 0.1800000000
Low 0.05 0.05
No. of Samples 74 1,547

Five-year Trend Graph

     
1/1/201361.6760.1001600mg/l
2/1/201361.6760.0876600mg/l
3/1/2013116.6760.0840500mg/l
4/1/201381.6760.0802800mg/l
5/1/201351.6760.0738900mg/l
6/1/201391.6760.0775000mg/l
7/1/2013155.0060.0930600mg/l
8/1/2013120.0060.1027800mg/l
9/1/2013110.0060.1016700mg/l
10/1/2013188.3360.1194500mg/l
11/1/2013108.3360.1288900mg/l
12/1/201371.6760.1255600mg/l
1/1/201466.6760.1108300mg/l
2/1/201480.0060.1041700mg/l
3/1/201496.6760.1019500mg/l
4/1/201498.3360.0869500mg/l
5/1/2014115.0060.0880600mg/l
6/1/2014105.0060.0936100mg/l
7/1/2014106.6760.1002800mg/l
8/1/201483.3360.1008300mg/l
9/1/201491.6760.1000000mg/l
10/1/2014100.0070.1002800mg/l
11/1/2014115.0060.1002800mg/l
12/1/201450.0070.0911100mg/l
1/1/201596.6760.0894500mg/l
2/1/201581.6760.0891700mg/l
3/1/201554.2970.0829400mg/l
4/1/2015110.0060.0846100mg/l
5/1/201568.5770.0768700mg/l
6/1/201565.0060.0793700mg/l
7/1/201588.3360.0779800mg/l
8/1/2015108.3360.0824200mg/l
9/1/2015101.6760.0903200mg/l
10/1/201595.0060.0878200mg/l
11/1/2015137.1470.0992500mg/l
12/1/201590.0060.1034100mg/l
1/1/2016130.0060.1103600mg/l
2/1/201668.5770.1037300mg/l
3/1/201682.8670.1006000mg/l
4/1/201681.6760.0983700mg/l
5/1/201691.4370.0907600mg/l
6/1/201671.6760.0877000mg/l
7/1/201670.0060.0777000mg/l
8/1/201661.6760.0765500mg/l
9/1/2016195.0060.0952400mg/l
10/1/2016201.6760.1152400mg/l
11/1/2016121.6760.1202800mg/l
12/1/201693.3360.1238900mg/l
1/1/201791.6760.1275000mg/l
2/1/201792.8670.1327000mg/l
3/1/201793.3360.1157600mg/l
4/1/2017131.6760.1040900mg/l
5/1/201776.6760.0965900mg/l
6/1/2017110.0060.0993700mg/l
7/1/201780.0060.0974200mg/l
8/1/2017103.3360.0991700mg/l
9/1/2017226.6760.1213900mg/l
10/1/2017175.0060.1286100mg/l
11/1/2017115.0060.1350000mg/l
12/1/2017100.0070.1333300mg/l
Loading Chart...
Target
0.18 mg/l
Threshold
0.21 mg/l

Dissolved Oxygen

Units: mg/l Year
2017
Historical
period of record
High 9.00 11.60
Mean 6.92 6.59 1.1558
Low 4.60 2.80
No. of Samples 72 1,650

Five-year Trend Graph

     
1/1/20136.5066.0300000mg/l
2/1/20138.1066.5300000mg/l
3/1/20136.9066.7200000mg/l
4/1/20136.5866.8000000mg/l
5/1/20136.6366.8500000mg/l
6/1/20135.2766.6600000mg/l
7/1/20137.1366.7700000mg/l
8/1/20135.2866.3000000mg/l
9/1/20136.2566.1900000mg/l
10/1/20136.0266.1000000mg/l
11/1/20137.2866.2100000mg/l
12/1/20136.7066.4400000mg/l
1/1/20147.3366.4800000mg/l
2/1/20147.9066.9100000mg/l
3/1/20146.7767.0000000mg/l
4/1/20147.0567.1700000mg/l
5/1/20147.5867.2200000mg/l
6/1/20145.8067.0700000mg/l
7/1/20144.8266.6500000mg/l
8/1/20143.6065.9400000mg/l
9/1/20144.6565.5800000mg/l
10/1/20146.8265.5500000mg/l
11/1/20147.6065.5500000mg/l
12/1/20146.4365.6500000mg/l
1/1/20156.8866.0000000mg/l
2/1/20158.1366.7500000mg/l
3/1/20157.6067.2400000mg/l
4/1/20157.0867.2900000mg/l
5/1/20156.7567.1500000mg/l
6/1/20157.4067.3100000mg/l
7/1/20155.0066.9900000mg/l
8/1/20157.8866.9500000mg/l
9/1/20156.0866.7000000mg/l
10/1/20156.3366.5700000mg/l
11/1/20156.3566.5100000mg/l
12/1/20156.7866.4000000mg/l
1/1/20167.3766.8000000mg/l
2/1/20167.8566.7900000mg/l
3/1/20167.2566.9900000mg/l
4/1/20167.1367.1200000mg/l
5/1/20167.1367.2500000mg/l
6/1/20166.2367.1600000mg/l
7/1/20165.6266.8700000mg/l
8/1/20165.7566.5200000mg/l
9/1/20168.5366.7300000mg/l
10/1/20166.4266.6100000mg/l
11/1/20166.2566.4700000mg/l
12/1/20167.0866.6100000mg/l
1/1/20178.3267.0600000mg/l
2/1/20176.6867.2100000mg/l
3/1/20177.2066.9900000mg/l
4/1/20176.7267.0400000mg/l
5/1/20176.4267.0700000mg/l
6/1/20177.2367.1000000mg/l
7/1/20176.3366.7600000mg/l
8/1/20176.2266.6900000mg/l
9/1/20176.6766.6000000mg/l
10/1/20177.3666.7100000mg/l
11/1/20176.8666.7800000mg/l
12/1/20177.0366.7500000mg/l
Loading Chart...
Target
mg/l
Threshold
0.00 mg/l

Light Attenuation

Units: K(1/m) Year
2017
Historical
period of record
High 4.14 4.14
Mean 1.17 1.01 0.47066
Low 0.20 0.08
No. of Samples 72 1,432

Five-year Trend Graph

     
1/1/20130.6761.2100000K(1/m)
2/1/20130.7561.0500000K(1/m)
3/1/20130.8760.9200000K(1/m)
4/1/20130.8260.8300000K(1/m)
5/1/20130.6460.7600000K(1/m)
6/1/20130.9660.7900000K(1/m)
7/1/20131.7060.9600000K(1/m)
8/1/20131.1861.0300000K(1/m)
9/1/20131.4561.1300000K(1/m)
10/1/20131.8261.2900000K(1/m)
11/1/20131.0061.3500000K(1/m)
12/1/20130.6461.3000000K(1/m)
1/1/20140.4761.0900000K(1/m)
2/1/20140.6061.0000000K(1/m)
3/1/20140.7960.8900000K(1/m)
4/1/20140.9460.7400000K(1/m)
5/1/20140.8260.7100000K(1/m)
6/1/20140.8460.7400000K(1/m)
7/1/20140.7460.7900000K(1/m)
8/1/20140.7260.8100000K(1/m)
9/1/20140.7860.8100000K(1/m)
10/1/20141.9060.9700000K(1/m)
11/1/20140.9260.9800000K(1/m)
12/1/20140.6060.9400000K(1/m)
1/1/20150.9060.9700000K(1/m)
2/1/20150.9461.0100000K(1/m)
3/1/20150.8161.0100000K(1/m)
4/1/20150.6460.8000000K(1/m)
5/1/20150.6160.7500000K(1/m)
6/1/20150.7160.7700000K(1/m)
7/1/20150.5960.7200000K(1/m)
8/1/20151.2060.7600000K(1/m)
9/1/20151.4460.8700000K(1/m)
10/1/20151.3660.9900000K(1/m)
11/1/20151.2561.0900000K(1/m)
12/1/20151.0761.1500000K(1/m)
1/1/20160.5561.1500000K(1/m)
2/1/20161.1061.1300000K(1/m)
3/1/20160.9561.0500000K(1/m)
4/1/20160.8660.9600000K(1/m)
5/1/20160.6760.8700000K(1/m)
6/1/20160.8660.8300000K(1/m)
7/1/20160.6960.8600000K(1/m)
8/1/20160.8060.8100000K(1/m)
9/1/20162.7461.1000000K(1/m)
10/1/20161.3561.1900000K(1/m)
11/1/20161.4961.3200000K(1/m)
12/1/20160.9761.3400000K(1/m)
1/1/20170.6961.3400000K(1/m)
2/1/20170.6261.3100000K(1/m)
3/1/20170.6060.9500000K(1/m)
4/1/20170.6460.8400000K(1/m)
5/1/20170.7960.7200000K(1/m)
6/1/20171.2360.7600000K(1/m)
7/1/20170.6560.7600000K(1/m)
8/1/20171.3260.8700000K(1/m)
9/1/20173.0461.2800000K(1/m)
10/1/20171.7561.4600000K(1/m)
11/1/20171.3661.5600000K(1/m)
12/1/20171.3861.5800000K(1/m)
Loading Chart...
Target
K(1/m)
Threshold
0.00 K(1/m)

Rainfall

Units: inches/yr Year
2017
Historical
period of record
High 31.50 50.76
Mean 36.3 12.7893956445323
Low 7.86
No. of Samples 250 5,050

Five-year Trend Graph

     
1/1/20130.26310.2600000inches
2/1/20131.01231.0100000inches
3/1/20131.53301.5300000inches
4/1/20132.81302.8100000inches
5/1/20132.05312.0500000inches
6/1/201314.823014.8200000inches
7/1/20136.29316.2900000inches
8/1/20138.54318.5400000inches
9/1/20138.04308.0400000inches
10/1/20131.05311.0500000inches
11/1/20131.19301.1900000inches
12/1/20130.17310.1700000inches
1/1/20145.24315.2400000inches
2/1/20141.28281.2800000inches
3/1/20144.63314.6300000inches
4/1/20141.34291.3400000inches
5/1/20144.16314.1600000inches
6/1/20143.57303.5700000inches
7/1/20143.33313.3300000inches
8/1/20144.10284.1000000inches
9/1/20147.31257.3100000inches
10/1/20142.32292.3200000inches
11/1/20143.07303.0700000inches
12/1/20140.44310.4400000inches
1/1/20151.91311.9100000inches
2/1/20155.14285.1400000inches
3/1/20152.43312.4300000inches
4/1/20150.65300.6500000inches
5/1/20151.98311.9800000inches
6/1/20153.00303.0000000inches
7/1/201513.033113.0300000inches
8/1/20155.46315.4600000inches
9/1/20157.42307.4200000inches
10/1/20151.59311.5900000inches
11/1/20150.74300.7400000inches
12/1/20152.72312.7200000inches
1/1/20166.47316.4700000inches
2/1/20161.83291.8300000inches
3/1/20163.30313.3000000inches
4/1/20160.52300.5200000inches
5/1/20165.95315.9500000inches
6/1/20164.77304.7700000inches
7/1/20163.38313.3800000inches
8/1/201612.483112.4800000inches
9/1/20164.63304.6300000inches
10/1/20163.78313.7800000inches
11/1/20160.05270.0500000inches
12/1/20160.38310.3800000inches
1/1/20171.06311.0600000inches
2/1/20171.73281.7300000inches
3/1/20172.21312.2100000inches
4/1/20170.48300.4800000inches
5/1/20174.01314.0100000inches
6/1/201712.423012.4200000inches
7/1/20176.03236.0300000inches
8/1/20170.0010.0000000inches
9/1/20170.0150.0100000inches
10/1/20172.71102.7100000inches
11/1/20170.26160.2600000inches
12/1/20170.58140.5800000inches
Loading Chart...
Target
inches/yr
Threshold
inches/yr

Salinity

Units: PSS Year
2017
Historical
period of record
High 35.90 39.50
Mean 28.59 30.5 4.94167
Low 12.30 7.30
No. of Samples 72 1,650

Five-year Trend Graph

     
1/1/201333.08630.4400000PSS
2/1/201333.55631.4000000PSS
3/1/201333.42632.3000000PSS
4/1/201332.05633.2400000PSS
5/1/201332.73633.0900000PSS
6/1/201335.40633.3700000PSS
7/1/201322.20631.5600000PSS
8/1/201325.45630.2100000PSS
9/1/201320.17628.0000000PSS
10/1/201320.95626.1500000PSS
11/1/201328.95625.5200000PSS
12/1/201331.25624.8300000PSS
1/1/201432.88626.6100000PSS
2/1/201431.53627.6200000PSS
3/1/201432.10629.6100000PSS
4/1/201429.00630.9500000PSS
5/1/201427.45630.7000000PSS
6/1/201432.33630.8800000PSS
7/1/201431.97630.7300000PSS
8/1/201432.62630.9100000PSS
9/1/201431.52630.8200000PSS
10/1/201420.27629.3600000PSS
11/1/201430.33629.8400000PSS
12/1/201429.10629.3000000PSS
1/1/201532.23629.3500000PSS
2/1/201530.20628.9400000PSS
3/1/201528.72628.4800000PSS
4/1/201531.27630.3100000PSS
5/1/201534.15630.9500000PSS
6/1/201533.95631.7500000PSS
7/1/201534.68632.1600000PSS
8/1/201520.97630.6200000PSS
9/1/201524.33629.8900000PSS
10/1/201523.37628.5800000PSS
11/1/201530.63627.9900000PSS
12/1/201531.90627.6500000PSS
1/1/201632.15627.2300000PSS
2/1/201626.32628.1200000PSS
3/1/201629.62629.0000000PSS
4/1/201630.12630.1200000PSS
5/1/201629.40629.9200000PSS
6/1/201629.68629.5500000PSS
7/1/201630.78629.3200000PSS
8/1/201629.75629.8900000PSS
9/1/201615.55627.5500000PSS
10/1/201618.77625.6600000PSS
11/1/201629.67625.7000000PSS
12/1/201632.82626.2200000PSS
1/1/201733.08626.6100000PSS
2/1/201733.15627.1700000PSS
3/1/201734.47630.3300000PSS
4/1/201734.22632.9000000PSS
5/1/201735.73633.9100000PSS
6/1/201722.77632.2400000PSS
7/1/201728.98631.5500000PSS
8/1/201724.37630.0900000PSS
9/1/201715.52626.9300000PSS
10/1/201722.70625.0100000PSS
11/1/201726.93623.5500000PSS
12/1/201731.15624.9400000PSS
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Turbidity

Units: NTU Year
2017
Historical
period of record
High 11.00 18.00
Mean 3.68 3.93 2.02021
Low 1.40 0.60
No. of Samples 74 1,547

Five-year Trend Graph

     
1/1/20132.3864.7800000NTU
2/1/20134.0064.5900000NTU
3/1/20133.5363.8500000NTU
4/1/20134.8363.7800000NTU
5/1/20134.1763.6600000NTU
6/1/20134.4263.8900000NTU
7/1/20135.1564.3500000NTU
8/1/20133.7364.3100000NTU
9/1/20136.2864.7600000NTU
10/1/20135.3364.8500000NTU
11/1/20134.5264.9100000NTU
12/1/20132.9864.6700000NTU
1/1/20142.4564.2200000NTU
2/1/20141.9063.9100000NTU
3/1/20143.1763.3900000NTU
4/1/20143.6563.1100000NTU
5/1/20143.3762.9200000NTU
6/1/20142.7862.8900000NTU
7/1/20142.6862.9300000NTU
8/1/20142.6263.0500000NTU
9/1/20142.3862.9100000NTU
10/1/20145.0073.1400000NTU
11/1/20142.7063.0300000NTU
12/1/20141.4872.8100000NTU
1/1/20155.7863.3300000NTU
2/1/20153.7363.5100000NTU
3/1/20152.6973.5600000NTU
4/1/20153.6263.3300000NTU
5/1/20152.9473.3700000NTU
6/1/20152.4263.5300000NTU
7/1/20152.2862.9500000NTU
8/1/20153.9362.9800000NTU
9/1/20154.2563.2400000NTU
10/1/20155.3263.5200000NTU
11/1/20155.5173.9500000NTU
12/1/20153.7764.1800000NTU
1/1/20162.3264.1800000NTU
2/1/20162.9174.0100000NTU
3/1/20164.0773.9800000NTU
4/1/20163.9063.7500000NTU
5/1/20162.2373.2000000NTU
6/1/20162.2762.9500000NTU
7/1/20162.6863.0100000NTU
8/1/20162.9263.0100000NTU
9/1/20166.2863.3800000NTU
10/1/20164.6063.5000000NTU
11/1/20166.5364.2100000NTU
12/1/20163.4564.4100000NTU
1/1/20172.4264.3700000NTU
2/1/20172.6074.3100000NTU
3/1/20172.5063.6800000NTU
4/1/20175.0763.7600000NTU
5/1/20172.7063.1200000NTU
6/1/20172.6562.9900000NTU
7/1/20172.0262.9200000NTU
8/1/20172.7362.9500000NTU
9/1/20177.3563.7500000NTU
10/1/20174.3263.6300000NTU
11/1/20174.1763.8700000NTU
12/1/20175.5674.3600000NTU
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Other Measures of Bay Health

In addition to nutrient levels and chlorophyll concentration, dissolved oxygen levels, and water clarity are also objective indicators of bay health. These have complex interactive cycles which are affected by rainfall, temperature, and tidal action, as well as other factors. High nutrient levels (nitrogen and phosphorus) can stimulate excessive growth of marine algae (indicated by chlorophyll a level), resulting in reduced water clarity (and increased light attenuation) and depleted oxygen levels. Both plants and animals in a bay need oxygen to survive, and the seagrasses which provide food and cover for bay creatures need light for photosynthesis.

Bay Contour Maps (2017)

Contour mapping is one of the best ways to visualize spatial differences in coastal water quality. The interactive map shown below presents monthly data for one selected water quality indicator atop an aerial view of the bay. Choose a different water quality parameter from the list at the top to change the map. Learn More about Water Quality Contour Mapping »

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Contour Visibility:

Visit the Water Quality Contour Mapping Tool to view and compare monthly water quality contour maps for ten different water quality indicators. In addition, you can generate your own custom maps.

Contour Legend:

  • Less than 1 mg/l
  • 1.0 - 5.9 mg/l
  • 6.0 - 10.9 mg/l
  • 11.0 - 17.9 mg/l
  • Greater than 18 mg/l

Seagrasses

Among the most important habitats in Florida's estuarine environments, seagrass beds are indispensable for the role they play in cycling nutrients, supplying food for wildlife, stabilizing sediments, and providing habitat for juvenile and adult finfish and shellfish. Use the interactive map below to observe the size, density and location of seagrass beds from year to year. The graph shows how the total amount of seagrass in the bay has changed over time. Learn More about Seagrasses »

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Target
702 acres

Land Use / Land Cover

Land use within a bay's watershed has a major effect on its water quality. In general, less development means better water quality. Land Cover/Land Use classifications categorize land in terms of its observed physical surface characteristics (upland or wetland, e.g.), and also reflect the types of activity that are taking place on it (agriculture, urban/built-up, utilities, etc.). Florida uses as its standard a set of statewide classifications which were developed by the Florida Department of Transportation. Learn More about Land Use and Land Cover »

Little Sarasota Bay is located within the Little Sarasota Bay Watershed. The chart below shows the land use / land cover characteristics for Little Sarasota Bay Watershed within the boundary of this Water Atlas. View details about the Little Sarasota Bay Watershed »

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